RT Journal Article SR Electronic T1 Reconstruction of 1,000 projection neurons reveals new cell types and organization of long-range connectivity in the mouse brain JF bioRxiv FD Cold Spring Harbor Laboratory SP 537233 DO 10.1101/537233 A1 Johan Winnubst A1 Erhan Bas A1 Tiago A. Ferreira A1 Zhuhao Wu A1 Michael N. Economo A1 Patrick Edson A1 Ben J. Arthur A1 Christopher Bruns A1 Konrad Rokicki A1 David Schauder A1 Donald J. Olbris A1 Sean D. Murphy A1 David G. Ackerman A1 Cameron Arshadi A1 Perry Baldwin A1 Regina Blake A1 Ahmad Elsayed A1 Mashtura Hasan A1 Daniel Ramirez A1 Bruno Dos Santos A1 Monet Weldon A1 Amina Zafar A1 Joshua T. Dudmann A1 Charles R. Gerfen A1 Adam W. Hantman A1 Wyatt Korff A1 Scott M. Sternson A1 Nelson Spruston A1 Karel Svoboda A1 Jayaram Chandrashekar YR 2019 UL http://biorxiv.org/content/early/2019/02/01/537233.abstract AB Neuronal cell types are the nodes of neural circuits that determine the flow of information within the brain. Neuronal morphology, especially the shape of the axonal arbor, provides an essential descriptor of cell type and reveals how individual neurons route their output across the brain. Despite the importance of morphology, few projection neurons in the mouse brain have been reconstructed in their entirety. Here we present a robust and efficient platform for imaging and reconstructing complete neuronal morphologies, including axonal arbors that span substantial portions of the brain. We used this platform to reconstruct more than 1,000 projection neurons in the motor cortex, thalamus, subiculum, and hypothalamus. Together, the reconstructed neurons comprise more than 75 meters of axonal length and are available in a searchable online database. Axonal shapes revealed previously unknown subtypes of projection neurons and suggest organizational principles of long-range connectivity.